Subterranean waters from the deepest revealed horizons of Dnieper-Donets depression
Keywords:
genesis of brines, dehydratation waters, secondly saltingAbstract
The bedding conditions, composition and probable genesis of subterranean waters obtained from maximum studied depths of 5,8-6,3 кm in Dnieper-Donets Depression are considered. These waters formed from chloride calcium-sodium brines with common mineralization of 130-340 g/dm3. The concentration of bromine varies from 7-18 to 335 mg/dm3. The brines are rich in boron, ammonium, lithium, rubidium, caesium. Isotopic composition of water molecules is characterized by considerable increase in isotopic weight of oxygen. Water dissolved gases include hydrocarbon, and in North-Volvenkovo structure they contain methane-dioxide.
Reservoir pressures are abnormally high. Pour out of brines with debits to 100-170 m3 for twenty four hours have been observed.
Analysis of chemical, microcomponental, isotopic and gas composition of brines permits to draw the conclusion that studied brines have formed from buried weakly salted sediment basin waters of dolomite stage of evaporite concentration. In deep catagenesis zone they were diluted with dehydratation waters and then were secondly salted with chloride sodium from Devonian salt domes and salt layers. Intensively secondly salted dehydratation waters have been found in North-Volvenkovo structurе.
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